1230512 _案號92122507_年月曰 修正_ 五、發明說明（1) 【發明所屬之技術領域】 本發明關於一種頻率合成電路，特別是關於一種用於 雙頻無線網路之頻率合成電路。 【先前技術】 資訊電子化及網路的發展，改變了人類的生活方式， 從工作需求到日常生活娛樂，幾乎都離不開網路的使用。 近幾年，由於無線區域網路的蓬勃發展，讓使用者可以在 辦公室、大樓、機場、實驗室等環境中隨時可以透過網路 獲得資料、語音以及影像等資訊，而不必受到網路佈線之 限制。 無線網路系統在I EEE標準委員會的制定下，目前已經 進入商品化的標準有8 0 2 · 1 1 a、8 0 2 · 1 1 b、8 0 2 · 1 1 g，而系 統操作頻率8 0 2. 1 la是使用5 1 5 0— 5 3 5 0MHz頻段，而 8 0 2. 1 lb及 8 0 2. 1 lg則是使用 24 0 0— 248 3. 5MHz頻段，第 1圖 所示為一超外差接收機架構圖，超外差接收機架構是歷史 悠久且一直被廣泛應用於無線射頻網路系統的架構，其接 收方式是將射頻（RF)訊號降至較低的中頻（IF)訊號 後，在降至基頻；傳送方式為基頻上升至中頻，再升頻至 射頻，在升/降頻轉換的混波器2中，皆必須提供一本地振 盪訊號4作為混頻訊號。 由於目前射頻無線網路系統有兩個不同頻段，為了讓 使用者可自由選擇使用的頻段，雙頻無線網路系統是為多 廠商努力的方向，而整合了兩個不同頻段的雙頻無線網路 系統其内部電路及元件是比較原先單頻系統來得複雜，而1230512 _ Case No. 92122507_ Year Month Amendment _ V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a frequency synthesis circuit, and more particularly to a frequency synthesis circuit for a dual-frequency wireless network. [Previous technology] The development of information electronics and the Internet has changed the way of life of human beings. From the needs of work to daily life and entertainment, the use of the Internet is almost inseparable. In recent years, due to the booming development of wireless local area networks, users can access data, voice, and image information through the network at any time in environments such as offices, buildings, airports, and laboratories, without being affected by network wiring. limit. The wireless network system is formulated by the I EEE Standards Committee. Currently, the standards that have entered commercialization are 80 2 · 1 1 a, 8 0 2 · 1 1 b, 8 0 2 · 1 1 g, and the system operating frequency is 8 0 2. 1 la is using the 5 1 5 0— 5 3 50 MHz band, while 8 0 2. 1 lb and 8 0 2. 1 lg is using the 24 0 0—248 3. 5 MHz band, as shown in Figure 1. It is a superheterodyne receiver architecture diagram. The superheterodyne receiver architecture has a long history and has been widely used in wireless RF network systems. Its receiving method is to reduce the radio frequency (RF) signal to a lower intermediate frequency. After the (IF) signal, it is reduced to the fundamental frequency; the transmission method is that the fundamental frequency is increased to the intermediate frequency and then increased to the radio frequency. In the mixer 2 of the up / down conversion, a local oscillation signal 4 must be provided as Mixed signal. Since the current radio frequency wireless network system has two different frequency bands, in order to allow users to freely choose the frequency band to use, the dual-frequency wireless network system is a direction for multi-vendor efforts, and integrates two different frequency bands of the dual-frequency wireless network The internal circuit and components of the circuit system are more complicated than the original single frequency system, and
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亦大幅提升 號在升/降步 作為混頻訊 生’ 一般射 貴，且占系 圖，此雙頻 個本地振盪 ’以產生射 為此兩組射 僅要增加頻 頻本地振盪 ’故為雙頻 SS 92122507 五、發明說明 整個系統 超外差接 中，皆必 振盪訊號 使用的頻 圖所示為 一中頻訊 有兩個是 轉換時所 號分別由 數目，造 相互干邊 須解決的 (2) ’如上述在一 尋轉換的過程 號，而此本地 頻電路系統所 统面積，第2 系統乃共用同 訊號源，其中 頻/中頻訊號 頻本地振盪訊 率合成電路的 訊號源之間會 無線系統所必 的使用面積及功率消耗 收機架構下，當系統訊 須提供一本地振盈訊號 需由一頻率合成電路產 率合成電路不僅價格昂 傳統雙頻無線系統方塊 號’整個系統仍需要三 產生射頻頻率之振盪器 需之本地振蘯訊號，因 不同的振盪器產生，不 成耗電量高、且兩組射 ’使系統工作效能降低 問題。 【發明内容】 =^=f解決上述問題而提供一種頻率合成電路， 用於雙„路系統中，以減少電路使用量及功耗消 耗，姐減^夕本地振盪訊號源引起的相互干擾。 針對上述目的，本發明提供一種雙頻無線網路之頻率 合成電絡包括一結合壓控振盪器之鎖相迴路，用以提供 第一本f振盈頻率，及一除頻電路，耦接於該壓控振盪器 之輸出端’用以提供第二本地振盪頻率。 本發明進而提供一種雙頻無線網路之頻率合成電路， 包括一結合第一壓控振盪器之第一鎖相迴路，用以提供第It also sharply increased the number in the up / down steps as a mixing signal. “General shooting is expensive, and it is a map. This dual-frequency local oscillation is used to generate a shot. For this two sets of shooting, only the frequency local oscillation needs to be increased.” SS 92122507 V. Description of the invention In the whole system, the frequency diagram used for the oscillating signal during super-heterodyne connection is shown as one of the IF signals. Two are the numbers used in the conversion. ) 'As described above in the process of seeking a conversion, and the area of this local frequency circuit system, the second system shares the same signal source, and the signal source of the frequency / intermediate frequency local oscillation signal synthesis circuit will Under the framework of the necessary area and power consumption of the wireless system, when the system signal must provide a local vibration signal, the frequency synthesis circuit must be produced by the frequency synthesis circuit. The synthesis circuit is not only expensive but the traditional dual-frequency wireless system. Three local oscillator signals required for the oscillator that generates radio frequency, due to the different oscillators, high power consumption is not required, and two sets of radios will reduce the system performance. . [Summary of the Invention] = ^ = f solves the above problem and provides a frequency synthesis circuit for use in a dual-channel system to reduce circuit usage and power consumption, and reduce mutual interference caused by local oscillator signal sources. For the above purpose, the present invention provides a frequency synthesizing circuit of a dual-frequency wireless network including a phase-locked loop combined with a voltage-controlled oscillator to provide a first f-oscillation frequency, and a frequency division circuit coupled to the The output terminal of the voltage-controlled oscillator is used to provide a second local oscillation frequency. The present invention further provides a frequency synthesizing circuit of a dual-frequency wireless network, which includes a first phase-locked loop combined with a first voltage-controlled oscillator for Provide the first
第7頁 1230512 案號 92122507 、發明說明（3) 本地振盪頻率；一除頻電路，耦接於該第一壓控振盪器 齡Γ出’ 用以窜 一 t · - 率 ·以及一 ！士^^第- 五 ^ ^ 7 柄w "、 〜、^ 一 一 …凰 之輸出端，用以提供第二本地振盪頻率；以及一結合第 麗控振鹽為之第二鎖相迴路，用以提供中頻本地振盪頻 率 〇 | 本發明還提供一種雙頻無線網路之頻率合成電路，包 括一頻率合成電路晶片及其周邊元件組成之第一、第二鎖 第一鎖相迴路用以提供中頻本地振盪頻率；以及一 丨頒率源勹用以為該晶片提供振盪參考源、，其令，該第 ^ ^ 一迴路濾湓1§，鉦垃於玆異Η ，m…、上 ί迴ί二第一鎖相迴路用以提供第一、第二本地振盪頻 幸，弟,一錯；^日 4® m .、》，《 參 鎖相迴路包括·· J迴二：供振好号…Τ，該第一 丨高頻訊號；-壓押护湯：波益，耦接於該晶片，用以濾除 |供第-本地振蘯步;；：2接於該迴路滤波器，用以提 振動器，用以將該壓 =率分配益，耦接於該壓控 丨頻電路，轉接於ίΓ::本地振盈訊號輪出，·=二 該第一功率八 弟一功率分配器另一跤鉍， 弟除 耦接於該第二配器之輸出訊號除頻；一从，出端，用以將 ;分為兩路7Ϊ;電路，用以將該第-C分配器’ 弟二除頻電路中一路作為第二本地振=頻電路輪出之訊 蠕，另—端為端耦接於該第二功率ί訊號輪出；及一 |出訊號除頰，妾=該晶片，用以將該第=配器另一路輸出 應用本私2符合該晶片的工作頻率〜功率分配器之輸 丨頻系統整ίί!之雙頻無線網路之頻i：_ I用兩個本地i Γ二模组，利用一套電路5電路，可將雙 又；矾號電路縮減為—個本1使原先一定要使 振盪訊號電路， 第8頁 1230512 _案號92122507_年月曰 修正_ 五、發明說明（4) 因此電路使用面積以及功率消耗都可減少一半，而且，利 用同一組本地振盪訊號電路提供雙頻系統本地振盪訊號， 可減少多個本地振盪訊號源引起的交互干擾，提升了系統 工作效能。 【實施方式】 一般而言，頻率合成電路都是由電壓控制振盪器結合 鎖相回路來形成的，以提供本地振盪訊號產生升降頻達到 頻率轉換之目的，因此，系統需要幾個本地振盪訊號，往 往就需要設計相同數量之鎖相回路形成的頻率合成電路， 而無線網路主要是使用在行動式資訊產品，故耗電量及系 統之面積大小皆是影響此無線網路系統實用性的重要因 素。本發明針對傳統雙頻無線網路系統之缺點，提出一種 雙頻無線網路之頻率合成電路，包括：一結合壓控振盪器 之鎖相迴路，用以提供第一本地振盪頻率，及一除頻電 路，耦接於該壓控振盪器之輸出端，用以提供第二本地振 蘯頻率。 如需進一步將中頻本地振盪訊號整合入電路，則本發 明之雙頻無線網路之頻率合成電路包括：一結合第一壓控 振盪器之第一鎖相迴路，用以提供第一本地振盪頻率；一 除頻電路，耦接於該第一壓控振盪器之輸出端，用以提供 第二本地振盪頻率；及一結合第二壓控振盪器之第二鎖相 迴路，用以提供中頻本地振盪頻率。 以2. 4/5. 2GHz雙頻無線網路系統為例，上述第一本地Page 7 1230512 case number 92122507, description of the invention (3) local oscillation frequency; a frequency division circuit, coupled to the first voltage controlled oscillator, age Γ out ′ for channeling a t ·-rate · and one! Shi ^^ No.-Five ^ ^ 7 handle w ", ~, ^ one by one ... the output terminal of the Phoenix is used to provide the second local oscillation frequency; and a second phase-locked loop combined with Di Li's vibration control salt, The invention provides an intermediate frequency local oscillation frequency. The invention also provides a frequency synthesizing circuit of a dual-frequency wireless network, which includes a first and second phase-locked first phase-locked loop composed of a frequency synthesizing circuit chip and its peripheral components. Provide an intermediate frequency local oscillation frequency; and a frequency source to provide an oscillation reference source for the chip, which makes the first loop filter 1§, 钲 钲 Η Η, m ..., upper The second phase-locked loop is used to provide the first and second local oscillation frequencies. Brother, one mistake; ^ 4 4 m., ", Participating in phase-locked loop includes ... No .... T, the first high-frequency signal;-Press and protect soup: Bo Yi, coupled to the chip to filter | for the first-local vibration step ;; 2 connected to the loop filter, It is used to lift the vibrator for distributing the voltage = rate distribution benefit, coupled to the voltage control frequency circuit, and transferred to ΓΓ :: local vibration surplus signal Out, · = two of the first power, eight power dividers, another power bismuth, and the frequency of the output signal coupled to the second power divider; one from and the other, used to divide; divided into two 7Ϊ ; Circuit for the second -C divider's second frequency division circuit all the way as the second local oscillator = frequency circuit rotation signal creep, the other end is coupled to the second power signal rotation output ; And a | The signal is removed from the cheek, 妾 = the chip, which is used to apply the other output of the third adapter to the working frequency of the chip ~ the output frequency of the power divider, the dual-frequency wireless system! The frequency of the network i: _ I uses two local i Γ two modules, using a set of circuit 5 circuits, can be doubled; alum number circuit is reduced to one, the original one must make the oscillating signal circuit, the 8th Page 1230512 _ Case No. 92122507_ Year and month amendment_ V. Description of the invention (4) Therefore, the circuit area and power consumption can be reduced by half, and the use of the same set of local oscillation signal circuits to provide local oscillation signals for dual-frequency systems can reduce Interactive interference caused by multiple local oscillator signal sources, improving system engineering Performance. [Embodiment] In general, the frequency synthesizing circuit is formed by a voltage controlled oscillator combined with a phase-locked loop to provide a local oscillation signal to generate frequency up and down to achieve the purpose of frequency conversion. Therefore, the system needs several local oscillation signals. Frequently, it is necessary to design a frequency synthesizing circuit formed by the same number of phase-locked loops. The wireless network is mainly used in mobile information products. Therefore, the power consumption and the area of the system are important factors that affect the practicality of this wireless network system. factor. The invention aims at the shortcomings of the traditional dual-frequency wireless network system, and proposes a frequency synthesizing circuit of the dual-frequency wireless network, which includes: a phase-locked loop combined with a voltage-controlled oscillator to provide a first local oscillation frequency, and a division Frequency circuit is coupled to the output terminal of the voltage controlled oscillator to provide a second local oscillator frequency. If it is necessary to further integrate the intermediate frequency local oscillation signal into the circuit, the frequency synthesizing circuit of the dual frequency wireless network of the present invention includes: a first phase locked loop combined with a first voltage controlled oscillator to provide a first local oscillation Frequency; a frequency division circuit coupled to the output terminal of the first voltage controlled oscillator to provide a second local oscillation frequency; and a second phase locked loop combined with the second voltage controlled oscillator to provide a medium Frequency local oscillation frequency. Take 2. 4/5. 2GHz dual-band wireless network system as an example, the first local
1230512 —---案號 92122507_^ B ^ — — —--曰 修正 五、發明說明（5) --- ^盈頻率為5 55 0〜5 72 0MHz，第二本地振盡頻率為2 77〇〜 28 6 0MHz;上述除頻電路可以為除二電路；而上述中頻本 ，振盪頻率，經過精確的數值計算及電路設計技巧，可將 中頻頻率定在374MHz，因此中頰本地振盪頻率為中頻的倍 頻，即 748MHz。 如第3圖所示，為本發明的較佳實施例之電路示意 圖，本發明提供一本地振盪訊號源6產生第一本地振盪訊 唬f 1，以作為系統之第一頻段射頻/中頻訊號轉換之混頻 訊號’再利用一 1/ 2除頻器8將此第一本地振盪訊號f 1除 頻為第二本地振盪訊號f 2，以做為系統第二頻段射頻/中 頻訊號轉換之混頻訊號’且透過適當設計及選擇之第一本 地振盪訊號f 1頻率及中頻訊號之頻率，使系統之雙頻段共 用一中頻的第三本地振盪訊號f 3，因此籍由本發明只需一 射頻振盪源及一中頻振盪源即可產生整個雙頻無線網路系 統所需之本地振盪訊號，故與傳統系統相較之下，具有減 少電路使用量及使用面積、減少系統功率消耗、及避免多 個振盪訊號源產生相互干擾之現象等優點，使此雙頻無線 網路系統之效能及實用性大幅提升。 第4圖所示為一雙頻無線網路系統電路圖，其操作頻 段選擇符合I EEE 8 0 2 · 1 1 a、8 0 2 · 1 1 b及8 0 2 · 1 1 g規範的 2 · 4 G Η z及5 . 2 G Η z頻段，此實施例之中/基頻調變電路係選 用R F M i c r 〇 D e ν i c e s公司之型號為R F 2 9 4 8的調變晶片1 〇， 而系統所需之本地振盪訊號則利用一頻率合成電路1 2來產 生，此雙頻系統可透過頻段切換開關1 6及天線開關1 4選擇1230512 ----- Case No. 92122507_ ^ B ^------- Amendment V. Description of the Invention (5) --- ^ The surplus frequency is 5 55 0 ~ 5 72 0 MHz, and the second local exhaustion frequency is 2 77. ~ 28 6 0MHz; the above frequency division circuit can be divided by two circuits; and the above intermediate frequency books, the oscillation frequency, after accurate numerical calculations and circuit design techniques, the intermediate frequency can be fixed at 374MHz, so the local frequency of the middle cheek is The octave of IF is 748MHz. As shown in FIG. 3, which is a schematic circuit diagram of a preferred embodiment of the present invention, the present invention provides a local oscillation signal source 6 to generate a first local oscillation signal f 1 as the first frequency band RF / IF signal of the system. The converted mixed frequency signal is further divided by a 1/2 frequency divider 8 to divide this first local oscillation signal f 1 into a second local oscillation signal f 2 as the conversion frequency of the system's second frequency band RF / IF signal. "Mixed signal" and through the proper design and selection of the frequency of the first local oscillation signal f 1 and the frequency of the intermediate frequency signal, the dual frequency bands of the system share a third local oscillation signal f 3 of the intermediate frequency. A radio frequency oscillation source and an intermediate frequency oscillation source can generate the local oscillation signals required by the entire dual-frequency wireless network system. Compared with traditional systems, it has the advantages of reducing circuit usage and area, reducing system power consumption, The advantages of avoiding the phenomenon of mutual interference of multiple oscillating signal sources and other advantages make the performance and practicability of this dual-band wireless network system greatly improved. Figure 4 shows a circuit diagram of a dual-band wireless network system. Its operating frequency band is selected in accordance with I EEE 8 0 2 · 1 1 a, 8 0 2 · 1 1 b, and 8 0 2 · 1 1 g specifications. 2 · 4 G Η z and 5.2 G Η z bands. In this embodiment, the modulation circuit of the fundamental frequency is RFM icr o D e ν ices. The modulation chip is RF 2 9 4 8 modulation chip, and The local oscillation signal required by the system is generated by a frequency synthesizing circuit 12. This dual-frequency system can be selected through the frequency band switch 16 and the antenna switch 1 4
第10頁 一 __案號 921225Π7 、發明一 、先所操作之頻段。 上述頻率合成電路丨2， 及其周邊元件組成之第— 供第一、第二本地 、肀頻本地振盪頻率；及 供振盪參考源。 曰其中，該第一鎖相迴路 =片，用以濾除高頻訊梦 ;濾、波器，用以提供第—： 态，耦接於該壓控振動器， 本地振盪頻率分為兩路， 曰 修正 片 路提提 該 號輪出 第一除頻電路 ，輪出端，用以將該第—功 々二功率分配器，耦接於該 除頻電路輸出之訊號分為兩 盪訊號輸出；及一第二除頻 分配态另一路輸出端，另_ ‘功率分配器之輸出訊號除 率 0 可以包括： 〜鎖相 4辰盪頻率， 參考頻率 &括：~迴 ;一壓控振 地振盪頻系用以將以 其中—路作 輕接於該第 率分配器之 第一除頻電 一頻率合成電路晶 迴路，第一鎖相迴 弟一鎖相迴路用以 源，用以為該晶片 路，其中一 電路’一端 端耗接於該 頻，以符合 路濾波器 蘯器，耦 ;一第一 控振盪器 為第一本 一功率分 輸出訊號 路，用以 路作為第 柄接於該 晶片，用 該晶片的 ’耦接於 接於該迴 功率分配 提供之第 地振盪訊 配器另一 除頻；* 將該第一 —i也寺辰 第二功率 以將該第 工作頻 第5圖所示為上述頻率合成電路之較佳實施例架構 圖’其係採用美國國家半導體公司（Nati〇nal Semiconductor Corporation)之型號為 LMX2 3 3 0L之雙頻 頻率合成器1 8來產生整個系統所需之本地振盪訊號，此頻 率合成電路1 2具有二個壓控振盪器2 〇，一個產生射頻振盪Page 10 1 __ Case No. 921225Π7, Invention 1, First frequency band operated. The above-mentioned frequency synthesizing circuit 2 and its peripheral components constitute the first-for the first, second local, and high-frequency local oscillation frequencies; and for the oscillation reference source. Among them, the first phase-locked loop = chip is used to filter high-frequency signal dreams; filters and wave filters are used to provide the first-: state, which is coupled to the voltage-controlled vibrator, and the local oscillation frequency is divided into two paths The correction circuit mentions that the first frequency dividing circuit is output from the wheel, and the wheel output end is used to couple the first power divider to the second frequency divider, and the signal output by the frequency dividing circuit is divided into two swing signal outputs. ; And a second output end of the second frequency division distribution state, and the output signal division rate of the power divider 0 may include: ~ phase-locked 4 oscillating frequency, reference frequency & including: ~ back; a voltage controlled vibration The ground oscillation frequency is used to connect the first circuit of the first frequency dividing circuit and the frequency synthesizing circuit of the frequency divider to the first frequency divider. The first phase-locked loop and the phase-locked loop are used as a source for the circuit. The chip circuit, one of the circuits' end is connected to the frequency to meet the circuit filter and coupler; a first controlled oscillator is the first book and a power division output signal circuit, which is connected to the circuit as the first handle. The chip is provided with the chip's coupling to the back power distribution Another frequency division of the ground oscillation distributor; * The first -i also Sichen second power to show the fifth working frequency Figure 5 is a diagram of the preferred embodiment of the above frequency synthesis circuit, its system The dual-frequency frequency synthesizer 18 of the National Semiconductor Corporation model LMX2 3 3 0L is used to generate the local oscillation signal required by the entire system. This frequency synthesis circuit 12 has two voltage-controlled oscillations. Device 2 〇, one produces RF oscillation
第11頁 1230512 _案號92122507_年月曰 修正_ 五、發明說明（7) 訊號源，另一個則為生中頻振盪訊號，整個頻率合成電路 1 2則利用此兩個壓控振盪器2 0及一參考訊號源2 2來控制產 生之本地振盪訊號，如圖所示，頻率合成器1 8所產生之第 一本地振盪訊號經過一功率分配器2 4將訊號分成兩路，一 路直接輸出當此雙頻無線網路系統高頻段冬本地振盪訊號 來源，而另一路則由一 1/ 2除頻器2 6接收並產生一第二本 地振盪訊號，其頻率為第一本地振盪訊號之一半，此第二 本地振盪訊號則作為系統中低頻段之本地振盪訊號來源。 為了適用於2. 4GHz及5. 2GHz之雙頻系統，經過精密計算及 設計，使此頻率合成電路1 2輸出之第一本地振盪訊號為 5 5 5 0〜5 7 2 0MHz，第二本地振盪訊號則為2 7 7 0〜2 8 6 0MHz， 而中頻之本地振盪訊號則為7 4 8 Μ Η z，由於R F 2 9 4 8調變晶片 1 0接收中頻訊號後，先經由一 1/ 2除頻器後才用來當中/ 基訊號轉換之混頻訊號，故系統之中頻訊號實際上為 3 74MHz。 第6A圖為5. 2GHz頻段的輸出頻譜圖，而第6B圖則為 2, 4GHz頻段之輸出頻譜圖。由第6A、6B圖的結果可以確定 此系統具有相當優異的效能。 以上所述者，僅為本發明其中的較佳實施例而已，並 非用來限定本發明的實施範圍；即凡依本創作申請專利範 圍所作的均等變化與修飾，皆為本創作專利範圍所涵蓋。Page 11 1230512 _Case No. 92122507_ Year Month Amendment _ V. Description of the invention (7) Signal source, the other is to generate IF oscillation signal, the entire frequency synthesis circuit 1 2 uses these two voltage controlled oscillators 2 0 and a reference signal source 2 2 to control the generated local oscillation signal. As shown in the figure, the first local oscillation signal generated by the frequency synthesizer 18 is divided into two by a power divider 2 4 and one is directly output. When this dual-band wireless network system has a high-frequency winter local oscillation signal source, the other way is received by a 1/2 frequency divider 2 6 and generates a second local oscillation signal whose frequency is half that of the first local oscillation signal. This second local oscillation signal is used as the source of the local oscillation signal in the low frequency band of the system. In order to be suitable for dual frequency systems of 2.4 GHz and 5. 2 GHz, after precise calculation and design, the first local oscillation signal output by the frequency synthesizer circuit 12 is 5 5 0 5 to 5 7 2 0 MHz, and the second local oscillation The signal is 277 0 ~ 2 860 MHz, and the local oscillation signal of the intermediate frequency is 7 4 8 MHz. Since the RF 2 9 4 8 modulation chip receives the intermediate frequency signal, it first passes a 1 The / 2 divider is only used for the mixed signal of the intermediate / base signal conversion, so the system intermediate frequency signal is actually 3 74MHz. Figure 6A is the output spectrum of the 5.2GHz band, and Figure 6B is the output spectrum of the 2, 4GHz band. From the results of Figures 6A and 6B, it can be confirmed that this system has quite excellent performance. The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention; that is, all equivalent changes and modifications made in accordance with the scope of the patent application for this creation are covered by the scope of the creation patent .
第12頁 1230512 _案號92122507_年月曰 修正_ 圖式簡單說明 第1圖：為用於射頻訊號之超外差接收機架構圖； 第2圖：為傳統雙頻無線系統方塊圖； 第3圖：為本發明之雙頻無線系統方塊圖； 第4圖：為雙頻無線網路系統方塊圖； 第5圖：為本發明頻率合成電路之實施例示意圖；及 第6 A、6 B圖：為本發明實施例之輸出頻譜圖。 【圖式符號說明】 2 混波器 4 本地振盪訊號 6 本地振盪訊號源 8 1/ 2除頻器 10調變晶片 1 2頻率合成電路 1 4天線開關 1 6頻段切換開關 1 8雙頻頻率合成器 2 0壓控振盪器 2 2爹考訊號源 2 4功率分配器 2 β 1/ 2除頻器Page 12 1230512 _Case No. 92122507_ Year Month Revision _ Brief description of the diagram Figure 1: Diagram of the architecture of a superheterodyne receiver for radio frequency signals; Figure 2: Block diagram of a traditional dual-band wireless system; Figure 3 is a block diagram of a dual-frequency wireless system of the present invention; Figure 4 is a block diagram of a dual-frequency wireless network system; Figure 5 is a schematic diagram of an embodiment of a frequency synthesizing circuit of the present invention; and Figures 6 A and 6 B Figure: This is an output spectrum diagram of an embodiment of the present invention. [Illustration of symbolic symbols] 2 mixer 4 local oscillation signal 6 local oscillation signal source 8 1/2 frequency divider 10 modulation chip 1 2 frequency synthesizing circuit 1 4 antenna switch 1 6 band switching switch 1 8 dual-frequency frequency synthesis 2 0 Voltage-controlled oscillator 2 2 Dao Kao signal source 2 4 Power divider 2 β 1/2 Divider
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